Ubuntu – Frozen on Installer Boot Menu


I am attempting to install ubuntu from a USB flash drive onto an old laptop with Windows XP. "Install Ubuntu" is highlighted in blue on the Installer boot menu and I have pressed Enter. 40 minutes later the screen still shows the Installer boot menu with Install Ubuntu highlighted and when I press any key, including escape, the computer beeps and nothing happens. What do I do now? Can anyone please help.

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